Tony Cuffe's tune is quite recent of course.

The song and tune from John Greig's Scots Minstrelsie(1895) can be found here: Scots Minstrelsie Vol6 (see pages 375-377; click on the thumbnails for the full image). The tune is not the same as the Polwarth version above.

A broadside (1869) can be seen here: We've Aye Been Provided For - Poet's Box; the tune to be used is give as original

Ord (1933), as Joe said in the other thread, specifies The Wearing of The Green.

(I still don't know what the earliest tune reference is).

Mick